Excavator oil lubrication system radiator, cooler components, etc

by:HMB     2021-01-25
1. Oil radiator and engine run cooler, due to the rise of oil viscosity with temperature is thinning, reduces the lubricating ability. Therefore, some with the engine oil cooler. There are two forms of oil cooler air cooled and water cooled, usually called the air-cooled engine oil radiator. Its function is to reduce the oil temperature, keep the lubricating oil viscosity. ( 1) The oil oil radiator radiator radiator pipe, the pressure limiting valve, switch, in and out of the tubing, etc. Its structure is similar to cooling water radiator. Oil radiator generally installed in the cooling water in the front of the radiator, and the main oil passage in parallel. Oil pump is working, on the one hand, the oil supply main oil way, on the other hand, the pressure limiting valve, oil radiator switch, into the tubing into the oil radiator, cooled from the flowline flows back to the oil pan, so circulating. ( 2) Oil cooler put oil cooler in cooling water, cooling water temperature is used to control the temperature of the lubricating oil. When high oil temperature, cooling water temperature, engine starting, absorb heat from the cooling water make lubricating oil rapidly raise the temperature. Oil cooler consists of cast aluminum alloy shell, front cover, back cover and the copper tube. In order to strengthen the cooling, tube and suit the heat sink. Cooling water outside the pipe flow, lubricating oil flow in the tube heat exchange with the both. Also has makes oil outside the pipe flow, and the structure of water flow in the tube. 2. Valves in the lubrication system is equipped with several pressure limiting valve and bypass valve, in order to ensure the lubrication system to work normally. ( 1) Pressure limiting valve oil supply pressure is increased with the increase of engine speed, oil silting up, and when the lubrication system of the bearing gap is too small or the use of the oil viscosity is too large, will also increase oil supply pressure. Therefore, in the lubrication oil pump and main oil way have limited pressure valve, limit the highest pressure, the oil in order to ensure safety. When the oil pump and main oil on the oil pressure exceeds a predetermined pressure, overcome the pressure limiting valve spring force, open the valve, part of the oil from the side channel flow within the oil pan, make oil passage for the oil pressure drops to set after normal, the valve closed. ( 2) Bypass valve bypass valve is used to ensure the oil flow in the lubrication system, when the oil filter clogging oil through parallel on the bypass valve directly into the lubrication system of main oil way, to prevent the main oil way off. Bypass valve and the pressure limiting valve structure is basically the same, only the installation position, the control pressure, overflow in a different direction, usually bypass valve spring stiffness is much smaller than the pressure limiting valve spring stiffness. 3. Oil dipstick and the oil pressure gauge rod is used to check in the amount of oil in the oil pan and the oil level of high and low. It is a piece of metal bar, flat bottom made, and the scribed line. The oil level of oil must be in the oil dipstick scribed line between up and down. The oil pressure gauge is used to indicate the size of the engine lubrication oil pressure in the system while working, use the electrothermal oil pressure gauge, it is composed of oil pressure gauge and sensor, using wire connection. Sensor is installed on the strainer or main oil path, it felt oil pressure to the oil pressure gauge. Oil pressure gauge in driving indoor dashboard, according to the size of the oil pressure value. 4. The engine crankcase ventilation, mixture and exhaust part of the piston ring leaking into the crankcase. After leaking into the crankcase of gasoline vapor condensation, will make the lubricating oil is thinning. At the same time, the acid in the high temperature of waste gas and waste gas and water vapor will be eroded parts, and makes lubricating performance deteriorate. In addition, due to the mixture and waste gas into the crankcase, increased the pressure inside the crankcase, temperature, easy to make the oil from the oil seal, gasket, etc to outside leakage. To this end, the general automobile engine has a crankcase ventilation device, so as to timely take out into the mixture formation within the crankcase and exhaust gas, make fresh air into the crankcase, convection. Crankcase ventilation ways generally has two kinds: one kind is natural ventilation, the other is a forced ventilation. ( 1) 。 Natural ventilation will of gas directly into the atmosphere from the crankcase ventilation way is called the natural ventilation. Diesel engine use the crankcase more natural ventilation mode. In the crankcase connecting valve cover or lubricating oil filling port pick out a prolapse of the trachea, cut into bevel nozzle, and the car moving in the direction of the incision in the opposite direction. The use of the car and air cooling fan, a certain vacuum degree at the outlet, the gas from the crankcase. ( 2) 。 Forced ventilation from the crankcase gas import engine intake pipe & rsquo; Suction cylinder combustion. This way of ventilation is called forced ventilation gasoline engine & ndash; Like all adopt the strong crankcase ventilation way, in this way, can be used to the mixture of recycling into the crankcase, is helpful to improve the economic benefit of the engine. Forced ventilation can be recycled mixture, reduce environmental pollution, general gasoline engines more mining, engineering machinery of diesel engine is generally adopt natural ventilation, ventilation/cover in the oil chamber, and with filter device, prevent dirt and impurities into the crankcase.
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